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/* Copyright (C) 2023 Aryadev Chavali
* You may distribute and modify this code under the terms of the
* GPLv2 license. You should have received a copy of the GPLv2
* license with this file. If not, please write to:
* aryadev@aryadevchavali.com.
* Created: 2023-10-15
* Author: Aryadev Chavali
* Description: Instructions and opcodes
*/
#ifndef INST_H
#define INST_H
#include <stdio.h>
#include <stdlib.h>
#include "./base.h"
#include "./darr.h"
typedef enum
{
OP_NOOP = 0,
OP_PUSH_BYTE,
OP_PUSH_HWORD,
OP_PUSH_WORD,
OP_PUSH_REGISTER_BYTE,
OP_PUSH_REGISTER_HWORD,
OP_PUSH_REGISTER_WORD,
OP_POP_BYTE,
OP_POP_HWORD,
OP_POP_WORD,
OP_MOV_BYTE,
OP_MOV_HWORD,
OP_MOV_WORD,
OP_HALT = 0b11111111, // top of the byte is a HALT
} opcode_t;
const char *opcode_as_cstr(opcode_t);
#define OPCODE_IS_TYPE(OPCODE, OP_TYPE) \
(((OPCODE) >= OP_TYPE##_BYTE) && ((OPCODE) <= OP_TYPE##_WORD))
typedef struct
{
opcode_t opcode;
data_t operand;
} inst_t;
void inst_print(inst_t, FILE *);
size_t inst_bytecode_size(inst_t);
void inst_write_bytecode(inst_t, darr_t *);
// Here the dynamic array is a preloaded buffer of bytes, where
// darr.available is the number of overall bytes and used is the
// cursor (where we are in the buffer).
inst_t inst_read_bytecode(darr_t *);
#define INST_BPUSH(BYTE) \
((inst_t){.opcode = OP_PUSH_BYTE, .operand = DBYTE(BYTE)})
#define INST_WPUSH(WORD) \
((inst_t){.opcode = OP_PUSH_WORD, .operand = DWORD(WORD)})
#define INST_FPUSH(FLOAT) \
((inst_t){.opcode = OP_PUSH_FLOAT, .operand = DFLOAT(FLOAT)})
#define INST_BMOV(REG) ((inst_t){.opcode = OP_MOV_BYTE, .operand = DBYTE(REG)})
#define INST_WMOV(REG) ((inst_t){.opcode = OP_MOV_WORD, .operand = DBYTE(REG)})
#define INST_FMOV(REG) ((inst_t){.opcode = OP_MOV_FLOAT, .operand = DBYTE(REG)})
#define INST_BPOP ((inst_t){.opcode = OP_POP_BYTE})
#define INST_WPOP ((inst_t){.opcode = OP_POP_WORD})
#define INST_FPOP ((inst_t){.opcode = OP_POP_FLOAT})
#define INST_BPUSH_REG(REG) \
((inst_t){.opcode = OP_PUSH_REGISTER_BYTE, .operand = DBYTE(REG)})
#define INST_WPUSH_REG(REG) \
((inst_t){.opcode = OP_PUSH_REGISTER_WORD, .operand = DBYTE(REG)})
#define INST_FPUSH_REG(REG) \
((inst_t){.opcode = OP_PUSH_REGISTER_FLOAT, .operand = DBYTE(REG)})
#endif
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